CN107300498B - Device for measuring carbon stable isotope ratio in carbon dioxide - Google Patents

Abstract

A device for measuring carbon stable isotope ratio in carbon dioxide relates to a device for measuring carbon stable isotope ratio in carbon dioxide. The invention is to solve the technical problems of time-consuming, high cost and poor effect of removing impurity gas when measuring the carbon stable isotope ratio in carbon dioxide. The device for measuring the carbon stable isotope ratio in carbon dioxide of the present invention is composed of a positioning frame, a sample bottle, an air bag, a sealing gasket and a sample bottle cap; The inner wall of the upper end of the sample bottle, the sample bottle cap is fixed with the upper end of the sample bottle through the thread, and the positioning frame is sleeved on the outer wall of the sample bottle cap. Using the device of the present invention to replace the existing sample bottle can save 50% of the test cost, and at the same time save 50% of the time for exhausting impurity gas and injecting gas samples into the sample bottle; the device of the present invention has ingenious design, reasonable structure and easy disassembly and assembly. , Easy to transport and easy to use.

Description

A device for measuring carbon stable isotope ratio in carbon dioxide

technical field

The invention relates to a device for determining the carbon stable isotope ratio in carbon dioxide.

Background technique

Carbon stable isotopes in carbon dioxide are of great significance to the research on climate change and ecosystem functions. The laboratory generally uses a multipurpose sample preparation device coupled with a stable isotope mass spectrometer to determine the carbon stable isotope ratio in carbon dioxide gas. Before the sample bottle is loaded, the impurity gas in the sample bottle that interferes with the measurement of the sample must be removed. There are two methods to remove the impurity gas. One method is to pass high-purity helium gas through the double-hole needle inserted into the instrument for about ten minutes. , In order to remove the impurity gas, a large flow rate of helium is required. This method is time-consuming and has high testing costs. Another method uses a vacuum pump to evacuate the sample bottle. This method is also time-consuming and labor-intensive, and the effect is not good.

SUMMARY OF THE INVENTION

The invention provides a device for measuring the carbon stable isotope ratio in carbon dioxide in order to solve the technical problems of time-consuming, high cost and poor effect of removing impurity gas when measuring the carbon stable isotope ratio in carbon dioxide.

The device for measuring the carbon stable isotope ratio in carbon dioxide of the present invention is composed of a positioning frame 1, a sample bottle 2, an air bag 3, a sealing gasket 4 and a sample bottle cap 5;

The positioning frame 1 is composed of a positioning rod 1-1 and a clamping head 1-2; the positioning rod 1-1 is a cylinder, and the interior of the positioning rod 1-1 is provided with a through hole 1-1-1 along the axis direction. ; The chuck 1-2 is a cylinder with a bottom on the end face, and the center of the circle on the outer wall of the end face with the bottom is fixed with one end of the positioning rod 1-1;

The sample bottle 2 consists of an upper threaded opening 2-3 and a lower bottle body 2-2. The upper threaded opening 2-3 is fixed on the upper end surface of the lower bottle body 2-2, and a top of the side wall of the bottle body 2-2 is provided. There is a vent hole 2-1;

The gasket 4 is a T-shaped rubber gasket, which consists of a thin end 4-3 and a thick end 4-2. The thin end 4-3 and the thick end 4-2 are both cylindrical and fixed coaxially. A hollow cone 4-1 is arranged at the center of the end face of 4-3, and the bottom surface of the hollow cone 4-1 is arranged on the end face of the thin end 4-3 of the gasket 4;

The sample bottle cap 5 is a plastic cap with a hole 5-1 in the middle of the bottom surface, and a thread is arranged inside the side wall of the sample bottle cap 5;

The airbag 3 is sleeved on the thin end 4-3 of the sealing gasket 4, the airbag 3 extends into the sample bottle 2, the thin end 4-3 of the sealing gasket 4 is clamped on the inner wall of the upper end threaded port 2-3 of the sample bottle 2, and the sample The bottle cap 5 is fixed with the thread opening 2-3 of the upper end of the sample bottle 2, and the clamping head 1-2 of the positioning frame 1 is sleeved on the outer wall of the sample bottle cap 5.

The using method of the device for measuring carbon stable isotope ratio in carbon dioxide of the present invention is as follows:

1. Remove impurities: insert the needle of the air-tight needle from the through hole 1-1-1 inside the positioning rod 1-1, penetrate the gasket 4, pull the piston of the air-tight needle, and pump out the gas in the air bag 3 , the outside air enters from the vent hole 2-1, keep the internal and external pressure of the sample bottle 2 balanced, and pull out the airtight needle;

2. Add sample: insert the airtight needle into the sample air bag to extract the sample gas, then insert the airtight needle into the through hole 1-1-1 inside the positioning rod 1-1 and penetrate the sealing gasket 4. The needle tip of the airtight needle is just located in the hollow cone 4-1 on the gasket 4 to prevent the needle tip from piercing the air bag 3, push the piston of the airtight needle, and inject the sample gas into the air bag 3, and the air in the sample tube 2 flows from the air bag. The air hole 2-1 is discharged, and the internal and external pressure of the sample bottle 2 is kept balanced, the airtight needle is pulled out, and the positioning frame 1 is placed;

3. Sample Determination: Place the sample bottle 2 filled with sample gas on the automatic sample inlet rack, and the multi-purpose sample preparation device is combined with a stable isotope mass spectrometer to determine the carbon stable isotope ratio in carbon dioxide gas.

Beneficial effects of the present invention:

Using the device of the present invention to replace the existing sample bottle can save 50% of the test cost, and at the same time save 50% of the time for exhausting impurity gas and injecting gas samples into the sample bottle;

The device of the invention has ingenious design, reasonable structure, easy disassembly and assembly, convenient transportation and convenient use.

Description of drawings

Fig. 1 is the schematic diagram of the device for measuring carbon stable isotope ratio in carbon dioxide according to Embodiment 1 when the airbag is in a natural state;

Fig. 2 is the schematic diagram of the device for measuring the carbon stable isotope ratio in carbon dioxide according to the specific embodiment 1 when the air bag has completely removed impurities;

3 is a schematic diagram of the device for measuring the carbon stable isotope ratio in carbon dioxide according to Embodiment 1 when the gas bag is filled with sample gas;

FIG. 4 is a schematic diagram of the sealing gasket 4 of the first embodiment;

FIG. 5 is a schematic diagram of the positioning frame 1 according to the first embodiment;

Fig. 6 is the schematic diagram of the sample bottle 2 of the specific embodiment one;

Fig. 7 is the front schematic view of the sample bottle cap 5 of the specific embodiment one;

FIG. 8 is a schematic top view of the sample bottle cap 5 according to the first embodiment.

Detailed ways

Embodiment 1: This embodiment is a device for measuring the carbon stable isotope ratio in carbon dioxide, as shown in Figures 1-8, which is specifically composed of a positioning frame 1, a sample bottle 2, an air bag 3, a sealing gasket 4 and a sample bottle cap 5 composition;

The positioning frame 1 is composed of a positioning rod 1-1 and a clamping head 1-2; the positioning rod 1-1 is a cylinder, and the interior of the positioning rod 1-1 is provided with a through hole 1-1-1 along the axis direction. ; The chuck 1-2 is a cylinder with a bottom on the end face, and the center of the circle on the outer wall of the end face with the bottom is fixed with one end of the positioning rod 1-1;

The sample bottle 2 consists of an upper threaded opening 2-3 and a lower bottle body 2-2. The upper threaded opening 2-3 is fixed on the upper end surface of the lower bottle body 2-2, and a top of the side wall of the bottle body 2-2 is provided. There is a vent hole 2-1;

The gasket 4 is a T-shaped rubber gasket, which consists of a thin end 4-3 and a thick end 4-2. The thin end 4-3 and the thick end 4-2 are both cylindrical and fixed coaxially. A hollow cone 4-1 is arranged at the center of the end face of 4-3, and the bottom surface of the hollow cone 4-1 is arranged on the end face of the thin end 4-3 of the gasket 4;

The sample bottle cap 5 is a plastic cap with a hole 5-1 in the middle of the bottom surface, and a thread is arranged inside the side wall of the sample bottle cap 5;

The airbag 3 is sleeved on the thin end 4-3 of the sealing gasket 4, the airbag 3 extends into the sample bottle 2, the thin end 4-3 of the sealing gasket 4 is clamped on the inner wall of the upper end threaded port 2-3 of the sample bottle 2, and the sample The bottle cap 5 is fixed with the thread opening 2-3 of the upper end of the sample bottle 2, and the clamping head 1-2 of the positioning frame 1 is sleeved on the outer wall of the sample bottle cap 5.

The method of using the device for measuring the carbon stable isotope ratio in carbon dioxide of the present embodiment is as follows:

1. Remove impurities: insert the needle of the air-tight needle from the through hole 1-1-1 inside the positioning rod 1-1, penetrate the gasket 4, pull the piston of the air-tight needle, and pump out the gas in the air bag 3 , the outside air enters from the vent hole 2-1, keep the internal and external pressure of the sample bottle 2 balanced, and pull out the airtight needle;

2. Add sample: insert the airtight needle into the sample air bag to extract the sample gas, then insert the airtight needle into the through hole 1-1-1 inside the positioning rod 1-1 and penetrate the sealing gasket 4. The needle tip of the airtight needle is just located in the hollow cone 4-1 on the gasket 4 to prevent the needle tip from piercing the air bag 3, push the piston of the airtight needle, and inject the sample gas into the air bag 3, and the air in the sample tube 2 flows from the air bag. The air hole 2-1 is discharged, and the internal and external pressure of the sample bottle 2 is kept balanced, the airtight needle is pulled out, and the positioning frame 1 is placed;

3. Sample Determination: Place the sample bottle 2 filled with sample gas on the automatic sample inlet rack, and the multi-purpose sample preparation device is combined with a stable isotope mass spectrometer to determine the carbon stable isotope ratio in carbon dioxide gas.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that the airbag 3 is a latex balloon. Others are the same as the first embodiment.

Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the material of the sample bottle 2 is stainless steel. Others are the same as in the first or second embodiment.

Embodiment 4: The difference between this embodiment and one of Embodiments 1 to 3 is that the material of the sample bottle 2 is high silicon boron acid and alkali resistant glass. Others are the same as one of Embodiments 1 to 3.

Embodiment 5: The difference between this embodiment and one of Embodiments 1 to 4 is that the material of the sample bottle 2 is high elastic rubber. Others are the same as one of Embodiments 1 to 4.

The present invention was verified with the following experiments:

Test 1: This test is a device for measuring the carbon stable isotope ratio in carbon dioxide, as shown in Figure 1-8, which is specifically composed of a positioning frame 1, a sample bottle 2, an air bag 3, a sealing gasket 4 and a sample bottle cap 5;

The positioning frame 1 is composed of a positioning rod 1-1 and a clamping head 1-2; the positioning rod 1-1 is a cylinder, and the interior of the positioning rod 1-1 is provided with a through hole 1-1-1 along the axis direction. ; The chuck 1-2 is a cylinder with a bottom on the end face, and the center of the circle on the outer wall of the end face with the bottom is fixed with one end of the positioning rod 1-1;

The sample bottle 2 consists of an upper threaded opening 2-3 and a lower bottle body 2-2. The upper threaded opening 2-3 is fixed on the upper end surface of the lower bottle body 2-2, and a top of the side wall of the bottle body 2-2 is provided. There is a vent hole 2-1;

The gasket 4 is a T-shaped rubber gasket, which consists of a thin end 4-3 and a thick end 4-2. The thin end 4-3 and the thick end 4-2 are both cylindrical and fixed coaxially. A hollow cone 4-1 is arranged at the center of the end face of 4-3, and the bottom surface of the hollow cone 4-1 is arranged on the end face of the thin end 4-3 of the gasket 4;

The sample bottle cap 5 is a plastic cap with a hole 5-1 in the middle of the bottom surface, and a thread is arranged inside the side wall of the sample bottle cap 5;

The airbag 3 is sleeved on the thin end 4-3 of the sealing gasket 4, the airbag 3 extends into the sample bottle 2, the thin end 4-3 of the sealing gasket 4 is clamped on the inner wall of the upper end threaded port 2-3 of the sample bottle 2, and the sample The bottle cap 5 is fixed with the thread opening 2-3 of the upper end of the sample bottle 2, and the clamping head 1-2 of the positioning frame 1 is sleeved on the outer wall of the sample bottle cap 5.

The device used for the determination of carbon stable isotope ratios in carbon dioxide for this test is used as follows:

1. Remove impurities: insert the needle of the air-tight needle from the through hole 1-1-1 inside the positioning rod 1-1, penetrate the gasket 4, pull the piston of the air-tight needle, and pump out the gas in the air bag 3 , the outside air enters from the vent hole 2-1, keep the internal and external pressure of the sample bottle 2 balanced, and pull out the airtight needle;

2. Add sample: insert the airtight needle into the sample air bag to extract the sample gas, then insert the airtight needle into the through hole 1-1-1 inside the positioning rod 1-1 and penetrate the sealing gasket 4. The needle tip of the airtight needle is just located in the hollow cone 4-1 on the gasket 4 to prevent the needle tip from piercing the air bag 3, push the piston of the airtight needle, and inject the sample gas into the air bag 3, and the air in the sample tube 2 flows from the air bag. The air hole 2-1 is discharged, and the internal and external pressure of the sample bottle 2 is kept balanced, the airtight needle is pulled out, and the positioning frame 1 is placed;

3. Sample Determination: Place the sample bottle 2 filled with sample gas on the automatic sample inlet rack, and the multi-purpose sample preparation device is combined with a stable isotope mass spectrometer to determine the carbon stable isotope ratio in carbon dioxide gas.

Claims (5)

1. A device for measuring the ratio of carbon stable isotopes in carbon dioxide is characterized in that the device for measuring the ratio of the carbon stable isotopes in the carbon dioxide comprises a positioning frame (1), a sample bottle (2), an air bag (3), a sealing gasket (4) and a sample bottle cap (5); the positioning frame (1) consists of a positioning rod (1-1) and a clamping head (1-2); the positioning rod (1-1) is a cylinder, and a through hole (1-1-1) is formed in the positioning rod (1-1) along the axis direction; the clamping head (1-2) is a cylinder with an end surface with a bottom, and the circle center on the outer wall of the end surface with the bottom is fixed with one end of the positioning rod (1-1); the sample bottle (2) consists of an upper end threaded port (2-3) and a lower end bottle body (2-2), the upper end threaded port (2-3) is fixed on the upper end face of the lower end bottle body (2-2), and a vent hole (2-1) is formed in the top of the side wall of the bottle body (2-2); the sealing gasket (4) is a T-shaped rubber gasket and consists of a thin end (4-3) and a thick end (4-2), the thin end (4-3) and the thick end (4-2) are both cylinders and are coaxially fixed, a hollow cone (4-1) is arranged at the center of the end face of the thin end (4-3) of the sealing gasket (4), and the bottom face of the hollow cone (4-1) is arranged on the end face of the thin end (4-3) of the sealing gasket (4); the sample bottle cap (5) is a plastic cap with a hole (5-1) in the middle of the bottom surface, and threads are arranged inside the side wall of the sample bottle cap (5); the air bag (3) is sleeved on the thin end (4-3) of the sealing gasket (4), the air bag (3) extends into the sample bottle (2), the thin end (4-3) of the sealing gasket (4) is clamped on the inner wall of the upper threaded port (2-3) of the sample bottle (2), the sample bottle cap (5) is fixed with the upper threaded port (2-3) of the sample bottle (2) through threads, and the clamping head (1-2) of the positioning frame (1) is sleeved on the outer wall of the sample bottle cap (5);

the device for determining the carbon stable isotope ratio in carbon dioxide is used as follows:

removing miscellaneous gas: inserting a needle head of the airtight needle into a through hole (1-1-1) in a positioning rod (1-1), penetrating a sealing gasket (4), pulling a piston of the airtight needle, pumping the air in an air bag (3), introducing external air from a vent hole (2-1), keeping the pressure balance inside and outside a sample bottle (2), and pulling out the airtight needle;

sample adding: the airtight needle head is inserted into the sample air bag to extract sample air, then the airtight needle head is inserted into a through hole (1-1-1) in a positioning rod (1-1) to penetrate through a sealing gasket (4), the needle point of the airtight needle head is just positioned in a hollow cone (4-1) on the sealing gasket (4) at the moment, the air bag (3) is prevented from being punctured by the needle point, a piston of the airtight needle is pushed, the sample air is injected into the air bag (3), the air in the sample bottle (2) is discharged from a vent hole (2-1), the balance of the internal and external pressures of the sample bottle (2) is kept, and the airtight needle is pulled out;

and (3) sample determination: and (3) placing the sample bottle (2) added with the sample gas on an automatic sample feeding rack, and measuring the carbon stable isotope ratio in the carbon dioxide gas by using the multi-purpose sample preparation device and a stable isotope mass spectrometer.

2. An apparatus for determining the carbon stable isotope ratio in carbon dioxide as claimed in claim 1, characterized in that said balloon (3) is a latex balloon.

3. The apparatus for determining the carbon dioxide carbon stable isotope ratio according to claim 1, characterized in that the sample bottle (2) is made of stainless steel.

4. The device for determining the carbon stable isotope ratio in carbon dioxide according to claim 1, wherein the material of the sample bottle (2) is high silicon boron acid and alkali resistant glass.

5. The device for measuring the carbon dioxide stable isotope ratio according to claim 1, characterized in that the sample bottle (2) is made of elastomer.

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